B&K Precision 2530B Instruction Manual download pdf

Oscilloscope and EKG sensor

Equipment DataStudio, BK Precision model 2530B oscilloscope, function generator, 2-3 foot

coax cable with male BNC connectors, BNC to female banana adapter, 1 voltage sensor, EKG

sensor, EKG Sensor Electrode Patches

Remark The oscilloscope is a diﬃcult instrument to understand, but it is also a very impor-

tant instrument. Studying this write-up carefully before the lab will be worthwhile. This

lab cannot be approached casually. The basics of a heart rate meter is an oscilloscope and

you will be using an EKG sensor to monitor your heart rate.

1 Introduction

The standard instrument for examining time dependent voltages in a circuit is the oscillo-

scope, or “scope” for short. Even if you are doing a DC experiment it is a good idea to

look at the circuit with a scope. You might ﬁnd a large AC signal symmetric with respect

to ground that does not show up on DC instruments but is aﬀecting your experiment in

undesirable ways, such as overloading a sensitive ampliﬁer. Oscilloscopes are ubiquitous in

the medical profession. They are seen next to hospital beds showing the electrical output of

a heart. They are used extensively in operating rooms.

A voltage which depends on time can be drawn on graph paper with the voltage on the

vertical axis and the time on the horizontal axis. If the voltage is periodic (repeats itself

after one cycle) an oscilloscope will present a similar curve. By adjusting the scope it is

possible to display part of one cycle or many cycles of the waveform. Properties of a periodic

voltage, such as shape, peak-to-peak amplitude and period, can be measured. Scopes have

other uses, but these are the primary subjects of this lab.

The oscilloscope is a sophisticated instrument. Competent use depends on understanding

how this instrument works. It is often necessary to consult the instruction manual for a

particular scope in order to use it eﬀectively. The basic ideas are usually the same but are

implemented in diﬀerent ways.

In this lab you will become familiar with 2 oscilloscopes, the model 2530B made by

BK Precision, and the DataStudio scope. Both these instruments do very much the same

thing except that the controls on the BK are mostly knobs and switches and those on the

DataStudio are icons and buttons. The DataStudio scope is digital. The input waveform is

digitized and stored, at least for a while.

In the last section of the lab you will be using an EKG sensor. An EKG sensor monitors

your heart rate by measuring the distribution of dipoles in the heart. The EKG sensor will

be used in conjunction with the oscilloscope to see your heart cycle as a function time. You

will determine the time of your P, Q, R, S, T cardiac cycle. Each letter represents the wave

function of your heart. The P wave is the initial pulse and that goes through the atrial

muscle. The Q, R, S is the electrical waveform in the ventricular muscle The Q wave is

down, R is up and the S is down. The last part is the T wave form. It represents the

repolarization of the ventricles.

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Summary of Contents

Page 1 - 1 Introduction

Oscilloscope and EKG sensorEquipment DataStudio, BK Precision model 2530B oscilloscope, function generator, 2-3 footcoax cable with male BNC connector

Page 2 - Figure 2:

DataStudio scopes is that in the DataStudio scope the controls are icon buttons, and a slideris used for the trigger level and slope. It is a small tr

Page 3

You will repeat the steps of the bullet points in section 4.4 of measuring the waveforms.The diﬀerence is that all three waveforms of the function gen

Page 4 - Figure 3:

Figure 6:At this point you should be using the smart cursor to make all your measurements forthe following activities.1. Measure the EKG of a person w

Page 5

Reattach the sensor wires to the electrodes on the person within thirty seconds after theexercise is done, and measure the EKG. Compare and contrast t

Page 6 - 4 Using The BK Oscilloscope

2 Description of How a Scope Displays a Single Periodic VoltageA periodic function in time is one that repeats itself again and again, such as a sine

Page 7

the electron beam is turned on and the time base oscillator applies the voltage ramp to thehorizontal axis. The input voltage is applied to the vertic

Page 8 - Figure 5:

slope of the input voltage. If VTis kept the same but triggering were set to occur onthe negative slope of the input signal, at what points of the inp

Page 9

box. After the name of the box, in parentheses, are the numbers of the controls that appearin that box. As you read, identify the boxes in Fig. 4. The

Page 10

13. CH2 VOLTS/DIV control. Adjusts the vertical sensitivity for channel 2 in ﬁxed amounts.14. CH2 INPUT JACK. Not needed in this lab.15. Horizontal TI

Page 11

4.1 PreliminariesRemove any input cables to the scope. Turn on the scope (2). In a few seconds you shouldsee a trace which is a horizontal line. If yo

Page 12 - Figure 6:

Connect the 50 Ω output of this oscillator to the CH1 vertical input (9) of the BK scopeusing the coaxial cable. See Fig. 5.Figure 5:Set the AMPL knob

Page 13 - 7 Finishing Up

4.3 Other Waveforms and Functions• Observe square and triangular waveforms from the function generator by pushing theappropriate buttons. The frequenc

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